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        General >> Problems >> ABS Issue - and it's starting to get grizzly!!
        
(Message started by: DazRSK on Nov 23^rd, 2006, 11:17am)

Title: ABS Issue - and it's starting to get grizzly!!
Post by DazRSK on Nov 23^rd, 2006, 11:17am

Sorry guys - I need to call on your advice (again) on this. For a person with low experience in sparks, I know my car is now in a heap of problems which has gone a bit ugly. Please bare with me -

Right - 1st problem - got in car at beginning of week and noticed that over 15mph , the abs light came on and was on for the rest of the journey. It did pass all the checks on start up and once setting off, no problem - but the light on came on as soon as over 15.

Some of you helpful chaps pointed towards the wheel sensors, which was going to be my next job this weekend - take them out to clean, replace and see if fault goes away. If one is broken/faulty, I've got an idea which one it probably is since I had the f/n/s wheel bearing replaced earlier this year and I wasn't as careful with my clumping mallet as I should have been. I haven't broken the external casing of sensor but there was a lot of shock treatment in the local area.

Until yesterday, no fuses were blowing. However, things have turned a little nastier - last night, got into car and noticed abs light illuminated right from the checking procedure. Pressed the brake pedal - no brake lights.

Upon first analysis, 1 fuse blown - 15A fuse 14 (brake / indicator lights). Replaced fuse and isolated that the brake light circuit was at fault by dabbing the pedal - blew again. I had pedal switch out and bypassed to eliminate switch - a fault I had earlier this year - and another fuse blew.

Went to battery side box - 30A fuse 47 (abs module) was blown. Went to replace it, spark then snap - fuse blew again - nothing was on (no ignition, nothing) so instant short circuit. So I have 2 circuits blowing fuses now.

Took the large connector plug off abs module - new 30A fuse in, spark, then snap. So something is short circuiting the abs module loom even when I have it disconnected. The only thing I didn't disconnect is the multiplug with just 2 wires going to outside of the abs module. In hindsight - perhaps I should have disconnected this.

BTW - the fuse boxes are dry and I have the battery cover - so I know this is not the issue.

Is the car terminal ??

On a serious point - what do you think ? Is the first problem related to the second ? I didn't think much voltage was thrown back up to the module from the sensors ? Also, what does fuse 47 do - which part of the module is it - have I disconnected the correct multiblock to isolate the problem or is it an abs loom issue ?

I know it's difficult to analyse what's gone wrong when reading someone's description of a problem but what do you guys think - any advice you can give would be really appreciated. I'll probably end up putting the car into a garage or auto electrician as, unless it is a simple fix, it will starting messing my head.

Sorry for the length of this and thanks to anybody for their help.

Daren

Title: Re: ABS Issue - and it's starting to get grizzly!!
Post by hellblue on Nov 23^rd, 2006, 9:05pm

I think you have 2 switches~ stop lamps & pedal position,looks like you will have to go through the wiring diagrames, i think the pos. switch feed to the power train contol module & speed control module if fitted,did you short out the right switch!!

Title: Re: ABS Issue - and it's starting to get grizzly!!
Post by DazRSK on Nov 27^th, 2006, 2:09pm

Thanks for the advice Hellblue - I did start looking at these circuits but once the 30A abs module fuse was blowing straight out, I turned my thoughts to a bigger issue.

Well the good news is that it is fixed and I thought I would post up the results so that anybody in the future who has abs warning light and abs and brake light fuse issues can refer to this - after exhausting all other obvious areas. It must be abs and brake light fuses - obviously just a brake light fuse could be just a switch malfunction.

The main loom to the abs module had shorted - 5/6 wires welded together. This explains the original fault (abs warning light on once over 15mph) - whereby, the symtoms were similar to an abs sensor failing. In fact, it was the wire back from the sensor to module which was obviously the first to go. The remainder of the wires followed suit afterwards, ending in complete failure.

The trouble with this fault is that it is hard to diagnose until some wires have severed or complete failure - for obvious reasons. I know that the previous owner had the car in and out of the Ford workshop on several occasions with an abs warning light problem, but they merely replaced the fuse and the problem went away. There is serious amounts of money though being paid to the dealer by the previous owner with regard to this problem though - and it was obviously never corrected.

Even when I first got the car, this issue reared its ugly head and fuses were shorting - but the issue then went away upon the application of the 2nd 30A fuse. If I was to lay a finger on why the issue happened back in May, then went away, then re-occurred for good last week - prior to both times, we had some really heavy storms and surface water was abundant with floods everywhere. It was always going to fail but the significant amount of 'splashed-up' standing water possibly helped it.

There we go. Roll on the next issue. ;D :o

Title: Re: ABS Issue - and it\'s starting to get grizzly!
Post by Highlander on Nov 27^th, 2006, 2:36pm

Was it the wiring near the ABS module mutiplug?

Title: Re: ABS Issue - and it's starting to get grizzly!!
Post by DazRSK on Nov 27^th, 2006, 3:11pm

Highlander - the wiring drops from the multiplug but the actual issue with mine was where the loom runs along the body - near the bottom of the radiator.

Title: Re: ABS Issue - and it\'s starting to get grizzly!
Post by Highlander on Nov 27^th, 2006, 5:09pm

Where all the gunge gathers :)